<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button id="btn">我是一个按钮</button>
   
    <script>

            const sc = new WebSocket('ws://127.0.0.1:3000/ws')
             sc.onopen(()=>{
                sc.send()
             })

     
    </script>
</body>
</html>